Penny tells Sheldon about the movie in "The Hofstadter Insufficiency" (S7E1). She thought that no one knew about the movie since it never came out; however, Howard found it online shortly after the guys met her in the "Pilot ". Even Sheldon had watched the movie. Leonard shows the movie (and his beautiful girlfriend) to his scientist colleagues on his North Seaexpedition in the summer of 2013.

Penny's scene.

In "The Friendship Turbulence" (S7E17), Penny told the guys she has turned down a part in the sequel to Serial Ape-ist ("Serial Ape-ist 2: Monkey See, Monkey Kill"). Later when her car breaks down and she needs money, she calls back for the part, but finds out that it has been given to someone else. Later, she is again offered the part and takes it, but is reluctant since the movie is so bad. She seeks the advice of Wil Wheaton who later she finds is in the movie playing an orangutan and her boyfriend/mad scientist. When Penny tries to get the director to have another take on her latest scene he fires her because they don't need her after that.

In The Gorilla Dissolution both Penny and Wil are working the movie, Penny was trying really hard to make the movie. But the director fired both of them from the set, Wil bounced back from another movie.

Known Dialogue

Notes

After the credits, Chuck Lorre's vanity card #451 shows a picture of the sequel's script. The title reads "SERIAL APE-IST 2: Monkey See, Monkey Kill, written by Vince Gilligan". Under the title, a hand written note reads: "Thanks Vince, You're a good sport, bitch ! [signed] Chuck".

There is a little-known straight-to-video movie from 2002 called ''Planet of the Erotic Apes'', alternatively titled "Babes in Kong-Land", starring soft-core actress Julie Strain. ("Queen of the B-Movies")

The movie became a cult hit after the movie was out. This movie was Penny's big break and her five minutes of fame.

I never did ask how Penny and Wil got their jobs back from the Gorilla Dissolution after the director fired them. They were re-hired off-screen.